EvtAmpIndex.cpp
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EvtAmpIndex.cpp
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	//--------------------------------------------------------------------------
	//
	// Environment:
	// This software is part of the EvtGen package developed jointly
	// for the BaBar and CLEO collaborations. If you use all or part
	// of it, please give an appropriate acknowledgement.
	//
	// Copyright Information: See EvtGen/COPYRIGHT
	// Copyright (C) 2002 Caltech
	//
	// Module: EvtAmp.cc
	//
	// Description: Class to manipulate the amplitudes in the decays.
	//
	// Modification history:
	//
	// RYD Nov 22, 2002 Module created
	//
	//------------------------------------------------------------------------
	//
	#include "EvtGenBase/EvtPatches.hh"
	#include "EvtGenBase/EvtAmpIndex.hh"
	#include <vector>
	using std::vector;


	EvtAmpIndex::EvtAmpIndex(std::vector<int> ind):
	_ind(ind),
	_size(ind.size()),
	_state(ind.size()),
	_nstate(ind.size())
	{
	int i;

	for(i=0;i<_size;i++) {
	_state[i]=0;
	if (i==0){
	_nstate[i]=1;
	}
	else{
	_nstate[i]=_nstate[i-1]*_ind[i];
	}
	}
	}


	void EvtAmpIndex::reset(){
	int i;
	for(i=0;i<_size;i++) {
	_state[i]=0;
	}
	}

	bool EvtAmpIndex::next(){
	int i;
	for(i=0;i<_size;i++) {
	_state[i]++;
	if (_state[i]<_ind[i]){
	return true;
	}
	else{
	_state[i]=0;
	}
	}
	return false;
	}

	int EvtAmpIndex::index(){

	int i;
	int ind=0;

	for(i=0;i<_size;i++) {
	ind+=_state[i]*_nstate[i];
	}

	return ind;

	}